Static transmitter for polyphase distant control systems



E. GRANAT 1,764,867

STATIC TRANSMITTER FOR POLYPHASE DISTANT CONTROL SYSTEMS June 17j, 1930.

Filed oo't.18, 192e 4 sheets-sheet 1 E. GRANAT Jne 17, 1930.

STATIC TRANSMITTER FOR POLYPHASE DISTANT CONTROL SYSTEMS 4 Sheets-Sheet. 2

Filed Oct. 18. 1926 Fija. .5'

mwen for' June 17, 1930.

E. GRANAT 11,764,867

STATIG TRANSMITTER FOR POLYPHASE DISTANT CONTROL SYSTEMS Filed Oct. 18, 19,26 4 Sheets-Sheet 5 BHP mechanical June 17, 1930. AE. GRANAT l (1,764,867.

STATIC TRANSMITTER FOR POLYPHASE DISTANT CONTROL SYSTEIS lllllllllllllllllllllllllllllllllllllllllll IIIIIIIIIIIIIIIHI Buen/cr Momes Patented June 17, 1930 T FICE ELIE GRANAT, PARIS, FRANCE, ASSIGNOR GF ONE-HALF TO COIEPAGNTE DES FORGES ET ACIERIES DE LA MARINE ET DHOMECOURT, 0F PARS, FRANCE, A COM- PANY 0F FRANCE STATIC TRANSMITTER FOR POLYPHASE DISTAN'I CONTR-OL SYSTEMS Application led ctober 18, 1926, Serial No. 142,448, and in France October 31, 1925.

My previous application, Ser. No. 56,380, filed Sept. 14, 1925, and entitled Polyphase distant control' system for differential transmission, describes ordinary differential polyphase distant control systems whereof the transmitter is an electric machine (generator or motor).

The present invention has for its object to provide, according to the same principles, ordinary and diferential polyphase and oney phase distant control systems whereof the transmitter comprises one or more stationary windings used either for adding corrections to the movements ork signals transmitted by any electric distant control system or for allowing, in such a. system, the play arising between the receiver -and the part controlled by it to be compensated by the action of a differential control system between the said receiver and controlled part; this latter arrangement allows for instance a gun to be controlled by the electric motor used as a receiver for a distant control system in spite of the angular displacement of the gun whilst tiring. The gear between the gun and the receiver would comprise in this case, a yfriction clutch.

'I have described hereinbelow by way Vof example and shown on appended drawings sucliarrangements fed with three-phase current. The same could be used with a onephase feeding current as described in the above-mentioned. parent specification. A receiving motor can be provided with as many receiving positions as may be desired, by giving its commutator a suitable number of segments.

Figs. 1 and 2 show distant control systems with ordinary Static transmitters, that of Fig. 1 being constituted by one winding and that of Fig. 2 by two windings.

Figs. 3 and 4 show differential static transmitters constituted respectively with one and two windings.

Fig. 5 shows ordinary static transmitters such as those shown on Figs. 1 and 2 used as relays between the transmitter and the receiver of a general dist-ant control system of any type for addinggiven corrections at any point of the transmission line,

Figs. 6, 7 and 8 show the control system connecting the receiving motor of an electric distant control system and the part it is to control, this control system comprising amechanical differential (Fig. 6) a static electric diiiierential provided with two movable brush holders (Fig. 7) or aV stat-ic electric differential comprising two ordinary transmitters placed respectively near the driving motor and near the part to be controlled and connected by transmission wires (Fig. 8).

Fig. 9 shows diagrammatically a complete plant for a distant transmission with correctA ing devices.

The ordinary electric control system with static transmitters shown on Fig. 1 is constituted as follows:

The static transmitter comprises a winding 1 wound on a magnetic core shown diagrami'natically at 3, the elements of this winding being connected with the segments of the commutator 2 and three equidistant terminals of the winding being connected with thc wire lines 13, 111, 15 of a three-phase feed system; on the commutator 2 rub three equidistant brushes 7, 8 and 9 which are borne by a movable brush-holder 16 controlled by the handwheel 17. These brushes are connected by means of sliding contacts, not shown, to the transmission wires 10, 11, 12 connecting the transmitter with the receiver.

The receiver comprises a three-'phase stator 18 provided with three equidist-ant terminals 20, 21, 22 fed through the wires 13, 14, 15 of the three-phase feed system. The threephase rotor 19 is provided with equidistant terminals 23, 24 and 25 on `its winding wherethrough it is connected through sliding contacts not shown with the line wires 10, 11, 12.

The device works in the following manner The movable brushes remaining stationary in two rotating fields induced in the stator and the rotor of the receiver on one hand through the three-phase feed system 13,14,15, and on the other through the wires 10, 11, 12 connected through the brushes 7, 8, 9 with the stationary segments of the commutator 2 of the winding 1 rotate at the same speed. Therefore the rotor of the receiving motor remains stationary. 1f by actuating the hand wheel 17 the setv of movable brushes 7, 8 and 9 'is moved over the commutator 2, the phase of the voltage -under these brushes will be modified with reference to that of theV threephase feed system 13,14, 15. Thereforethe rotatingfeld of the rotor 19 of the receiyer will be shifted with reference to the rotating field of the stator 18. The rotor will rotate Y by an angle equal to that by whichthe brushes 7, 8, 9, have rotated whereby the two rotating fields of the receiver will be put back Y into parallelism so that themovementsof the rotor 19 are wheel17.

The ordinary static transmitter shown on` controlled by those of the hand 2 is a modiliedform ofthe one shown yon Fig. 1, the difference residing in the pro-y Y able brushes 32, 33, 34 are connected through i `sliding contacts not shown with three wires 10, 11, 12 connecting the transmitterlwit-h the receiver. The device works in the sainemanner as that shown on Fig. with theadvantage that by means of the two windings 26 and 30 the voltage in the receiving motor can be brought to a redetermined value.

v'The differential static-transmitter shown on Fig 3 provided with-only fonewinding Visconstituted as follows.- Round the magnetic core 37 is evenly distributed a winding 38 the different elements of whichV are connected with thev segmentsfof acommutator 39. On this commutatorrrub Vtwo sets. of brushes; firstly the three brushes 40-41--42 connect-r ed with the three-phase distribution wires i 13,14, 15A and bornevby the movable brnsliholder 43 controlled by., the handwheel 44, secondlythe three brushes 45, 46, 47 connected` with the three transmission wires 10, 11,. 12 and boine byl the movable brush-holder. ,48, controlledfbyfthe handwheel 49. This transmitter is connected through the transmissionwires y10, 11, 12 lto a receiverof the type shownlon Fig. 1. It is easy to see that GO, l

for each .rotation of one of the brush sets,the rotor ofthe receiver will rotate vby a corre- ;y sponding amount.

`The static dilferentialtransmitter show'n on Fig. 4 an'd'provided with two windings is constituted as follows:y ,t l

Arprimary distributed ywinding `5() 1s provided with` a commutator 51 on which rub 'three brushes 52, 5,3, 54 connected with .the \,wires 13, 14, 15 of athree-phase distribution. These threebrushes 52, 53, 54 are borne by a movable brush-holder controlled by ay 6,5.; hand wheel 56. A secondary Winding 57 also distributedlias its elements connected with a commutator 58 on which rub three brushes 59, 60, 61 connected with the three transmission wires 62, 63,64. These three brushes 59, 6() 61 are boi-neby a movable-brush-holder 65 ycontrolled by a hand wheel'66. For each -rotation of one of the handwheels 56 or 66,

the rotor of the receiver similar to the one shown on Figl rotates by a corresponding amount.

These static transmitters can be used with advantage in electric distant control systems of any kind; for instance they can be used in a control system provided with a dynamic transmitter such as the one described in the applica-nts previous application Ser.` No. e 56,380 (patented Feb. 8, 1927, No. 1,616,795) for adding. suitable individual corrections at any pointof the transmission to vtlieangular movements transmitted.

As shown on the diagram of Fig. 5 such an application can be made as follows:

A differential distant'control transmitter 70, fed through the three-phase .wires 71 is provided'for instance with two controlling handwheels 7 2-73 one of which acts on the position of the set of movable brushes connected with the feed system`71 and the other on the position of the set connected with the v transmission wires 74. The transmitter feeds tlirou h the said wires v74 the three-phase rotor 6 of a receiver the three-phase stator of which is fed by the mains 71. One or more static transmitters are inserted in tlie wires- 74 of the type shown for instance on Figs. 1, 2, 3 or 4. Thewires 74 are connected to the feed side of the static transmitter-in thecase of only one winding as in Figs. 1 and 3 through three equidistant terminals or three brushesV such as 4, 5, 6 (Fig. 1) or 40, 41, 42

' (Fig. 3) and in the case of two windings as in Figs. 2 and 4 through tliree equidista-nt terminals or three brushes sucli as 27, 28, 29 or 52, 53, 54 (Fig. 4). The current issuing `out of the static transmitter is transmitted' ahandwheel as in the abovedescribed static transmitters.

These arrangements have been diagram#L matica-lly shown for an ordinary one-winding transmitterl 77 and for a differential two-` windings transmitter 78. It is easy to understand that by rotating the hand wheel in 77 or the two handwheels in 78, corrections can be added at intermediary stations tothe rotations transniitted'ffrom the transmitter 70 to the receiver 76.

The types ofstatic transmitters described hereinabove allow also the execution of an electric distantcontrol receiver wherein the play arising between the rotor of the receiver andthe part controlled by it is compensated or wherein the control of the said part is such as will cause its permanent concordance with through three movable brushes controlledlby i Y thereceiver if yit-is connected to it through a grammatically by the dash line 86. The receivery 80 comprisesan inducing stator the ydistributed winding of which has its segments connected with a commutator 87. On this commutator 87 rubs a set of movable ybrushes 88, 89, servingas terminals for the wires, not shown, feeding the receiver with D. C. or with one phase or polyphase A. C. In'view of providing for the accuracy of the movements of the racer 81, with reference to thoseof the rotor 84, a differential is used, the

vsatellite pinions 91,92, of which are secured to a holder 90 mechanically connected with the brush holder holding the movable brushes A88, 89. .One of the pinions of the differential is controlled by the racer 81 through a pinion 94 connectedmechanically as shown diagrammatically at 95 with the pinion 96 meshing with an auxiliary racers-97-lreyed to f `the'same'shaft as the main racer 81. The

other pinion 96 of the differential is controlled by the Arotor of the receiver through the pinions 99, 100 mechanically connected throughthe transmission diagrammatically shown .at-,101.

The device works in the following manner when there is no play in the transmission 86 connecting the rotor 84 with the racer 81, the reverse rotations ofthe two pinions 93 and 98 are equal kand therefore the satellite holder -90 is noty moved nor consequently the set of ybrushes 88, 89. The racer 81 is controlled accurately by the rotor 84 and' its movement-s are `in concordance with those transmitted to the-receiver. On the contrary if any play arisesinthe" transmission 85 or if it comprises a slidingpart such las a friction clutch 102 (which for instance in the case of the controlled part being `a gun, allows the racer81 Y tobe displaced bythe firing without the rotor :84 being moved' therebyland the rotor and l controlled part cease vata-given moment to be in'concordan'ce the pinions 93 and 98 of the differential will rotate byadifferent amount 'and thereby the satellites will move together with the movable brushe's'88, 89. This move- 'y lment of the brushes feeding the induced stator ofthe receivingvmotor is used for mal:-

/ing the rotor 874 continue its rotation by an amount `such as will bring the racer 81 into :the position corresponding exactly to the po- ;.si-tion given Aout-*bythe distance controlsystem. ,f The arrangement shown on Fig. 6 1s eXelcuted electrically on Fig. 7 by means of a differential static transmitter the winding of which is similar to that of the transmitter shown on Fig. 3 and replacing the mechanical differential of Fig. 6. This arrangement comprises a magnetic core 105 round which is distributed a winding 106 the dilerent elesame commutator107v bears also a secondV group o f three brushes 111, 112, 113 connected with the three wires 114 leading to the brushes rubbing on the commutator of the rotor 84 of the receiver. The three brushes 108, 109, 110 are borne by the movable brush holder 115 controlled by the auxiliary racer 97. The three brushes 111, 112, 113 are borne by the movable brush holder 116 controlled by therotor 84 of the receiver 80.

The working of this arrangement is easy to understand after the explanation given with reference to Fig. 6. yIf the positions of the rotor 84 and of the racerv81 remain in concordance the two sets of brushes rotate by an equal amount and the rotor 84 receives the impulses transmitted by its control device without the described arrangement interfering. On the contrary if there isa lack of concordance between 84 and 81 reason of play in the transmission or of the working of the frictional clutch 102, the two sets of brushes will not remain at the same distance one from the other and the rotor 84 will rotate by a complementary amount corresponding to the shifting of the racer with reference to the rotor, which amount is provided such Aas will bring back the racer 81 exactly into the position' corresponding to that transmitted by the distant control system. If it is'necessary to allow the transmitted rotation to be corrected at the receiver, a differential shown diagrammatically at 117 can be inserted on the shaft connecting the rotor 84 with the movable brush holder 116 bearing the three brushes 111, 112, 113. One of the pinions is connected with the rotor 84 and the other with the movable brush-holder 116l whereas the planet pinions are controlled by the handwheel 118. Evidently when the rotor 84 is shifted with reference toy the brushes`111, 112, 113 a corresponding correction will be brought to the position of the racer l81.

These correcting devices which comprise a mechanical differential (Fig. 6) or an electric differential (Fig. 7 provided with one single winding require mechanical connection with the rotor 84 on one hand and the `separated from each other and constituted by 'two distinct parts one of which is located near the receiver 84 and the other near the racer l81. AThis is equivalent to the use as an electric differential of two transmitters such `as the one shown on Fig. 1 in series. n c. According togFig. 8 which illustrates this arrangement, a first distributed .windin 120 iliade roundthe core 121 is connected wit the commutator 122 on whichrub three brushes 123, 124, 125 borncby a movable brush holder y126 controlled by the auxiliary racer y97. These three brushes 123, 124, 125 are connected with the connecting wires 10, 11, 12, leading from the transmitter of the distant control system. Three` equidistant terminals 127, '128, 129 of this winding 120 are connected through three wires with a second windin `distributed round a magnetic core 131 an connected-with a commutator 132 on whichrub t-he brushes 133, 134, 135. These brushes are borne by a movable brush holder 136 actuated by the yrotor 84 of the receiver 80. These three brushes 133, 134,135 are connected through three wires 137v with three brushes, not shown, which feed the three windings of the rotor 84 of lthe receiver. c Like in Figs. 6 and 7 a differential 117 controlled by a handwheel 118 allows corrections to be brought to the position of the racer at the receiving station. i v g The workingof this device is substantially the saine as that of the device shown` on Fig. 7. The rotation of Vthe transmitter is y transmitted through thel wires 10, 11, 12 tothefrotor 84 of the receiver 80 after assing through the windings120 and 130. lf the racer and the rotor are in concordance, the relative ,positions of the brushes 123, 124, 125 of the first vwinding 120 and of the brushes 133,' 134, 135 of the secondwinding 130 does not change and no correction is rmade on the line feeding the rotor of the receiver 80. On the contrary if the racer 81 is :shifted with reference to its position of vconcordance with the rotor, the two sets of i brushes of the electric differential are shifted one with reference. to the other and thereby a correction is made to the indications arriv- 5 0 ing attlie rotor 8,4, which correction is such as willgivetheracer 81`the correct position Corresponding tothe indications of the transmitter. j Y Y v y 4V Inthe case yof the VFigures 7 and 8, another correction can be addedat the receivingfstatin itself by providing a distributedl induc- ,ing winding on .the receiving motor the sections of which are-connected with the segmentsfofa commutator (see Fig.8) vfed with C." or (2."(poly hase or one-phase) through ,brushes borne by .a `movable brushliolde'r" mechanically" connected with a controllngpart.y w

Fig. 9 shows diagrammatically a complete plant for transmission from a transmitter 150 4meme? toa racer 81. The transmitter provided with three brushes 151 is fed by the mains and controls the receiver 80, one component of which is fed by the mains, the other being fed bythe brushes A15,1 of the transmitter by intermediate of the sets of the brushes 152 and 153, the. first set 152 is connected to the brushes 151 of the transmitter, and actuated by the racer, the second set is connected to the second com ponent of the receiver and actuated b thev rotor, if desired, by intermediate of a iterential 117 controlled by a hand wheel. Said two setsof brushes rubbing on commutatore 122 and 132 connected to windings 120 and' 130, wires 154 connecting together three equiau distant points taken on said windings so as to transmit the potential of the first set-'0f brushes to the second one in such manner that a shifting accidentally occurrin between the transmitter and vthe racer maygbe corrected.

What I claim is: f

1.In an electric distant control system comprisin a transmitter fedby the mains and in w ich a set of three brushes rubs on a commutator in such a manner that said brushes areV always connected with three equidistant points of the. winding connected with said commutator, and a receiver one ,componentfof which is fed, by the mains,

the other component being fed at three equidistant points by intermediate of brushes in connection with 'the set of brushes of the transmitter: an arrangement n adapted. to bring a racer back in concordance with the receiver in case of accidental shifting be' tween said racer and said receiverfactuating it, .this arrangement. consisting in two movable sets of three brushes each, the

first set being connected with the. three brushes of` the transmitter and actuated by the racer, the second set being connected with thejthree brushes of the receiver and actuated by;I itsA rotor, means to transmit the otential ofthe brushes of the first set to the rushes of the second one in such a manner that a shifting occurring between the poten- .tials of these sets causes the receiver to rotate in orderto correct the discordance.

, r2. In .an electric distant control system comprising a transmitter fed by the mains A.1;

and iii which a set of Atlireeibrushes rubs on a commutator in sucha mannerthat Seid brushes are always connected with three equidistant pointsfof the winding connected Y with said eommutator, and a receiver `one w component of whichl is fed bythe mains, the other component being fedat three equidistant points/by intermediate of brushes in Vconnection with yth'iset.c,f,l;rushes ofthe transmitter: an arrangement adapted to Im bring a racer back in concordance with the receiver yin case of'accidental shifting bef tween said racer and said receiver actuating it, this arrangement consistin in two movable sets of threebrushes eac the first set :B0

being connected with the three brushes of the transmitter and actuated by the racer, the second set being connected with the three brushes of the receiver and actuated by its rotor7 between the second set of brushes and the rotor of the receiver a mechanical device such as a diierential controlled by handwheel allowing to give an eXtra shifting' between said set of brushes and the rotor of the receiver, means to transmit the potential of the brushes of the first set to the brushes of the second one in such a manner that a shifting occurring between the potentials of these sets causes the receiver to rotate in order to correct the discordance.

3. In an electric distant control system comprising a transmitter fed by the mains l and in which a set of three brushes rubs on r signature.

a commutator in such a manner that said brushesl are always connected with three equidistant points of the winding connected with said commutator, and a receiver one component of which is fed by the mains, the other component being fed at three equidistant points by intermediate of brushes in connection with the set of brushes of the transmitter; an arrangement adapted to bring a racer back in concordance with the receiver in case of accidental shifting between said racer and said receiver actuating it, this arrangement consisting in two movable sets of three brushes each, the first set being connected with the three brushes of the transmitter and actuated by the racer, the second set being connected with the three brushes of the receiver and actuated by its rotor; the first set of brushes rubs on a commutator connected with a winding, the second set rubs on a second commutator connected with a second winding, both windings being connected to each other by wires, having the length desired, connected on three equidistant points with each winding. Y

In testimony whereof I have aiXed my ELIE GRANAT. 

